#include<stdio.h>

//c中的switch如果不加break会一直执行下去哦，go则不会

int main(){
    int a = 100;

    switch (a)
    {
    case 1:
        printf("1");
        break;
    case 100:
        printf("100\n");
    case 200:
        printf("200\n");
    case 300:
        printf("300\n");
        break;
    case 400:
        printf("400\n");    
    
    default:
        printf("default\n");
        break;
    }
}